【发布时间】：2014-04-04 19:53:07
【问题描述】：
我正在构建一套 Web 服务，它们都访问同一个数据库，但使用不同的凭据。因此，为了模块化数据库代码，我将其从每个 Web 应用程序 .WAR 文件中移出，并为数据库调用其自己的 .JAR 文件。因此，如果 WebApp1 和 WebApp2 使用 getAllColumnsFromTable1 MyBatis 调用，我不必在两个项目中定义相同的映射器和域对象。这样，如果 Table1 发生更改，我只需在一个地方更改 MyBatis 代码，并且复制和粘贴错误更少。
WebApp1 applicationContext.xml：
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config />
<context:component-scan base-package="com.example.webapp1.service" />
<context:component-scan base-package="com.example.webapp1.controller" />
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="java:/example/ds/WebApp1DS" />
</bean>
<bean id="databaseConnector" class="com.example.databaseconnector.connector"
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
所以我想传递给数据库连接器的 .JAR 文件只是 .WAR 正在使用的数据源。
WebApp1 pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>WebApp1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>3.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>com.example</groupId>
<artifactId>databaseconnector</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
然后在 .WAR 中的一项服务中有这样的东西
WebApp1 Service.java：
package com.example.webapp1.service;
import com.example.databaseconnector.domain.TableSearchResult;
import com.example.databaseconnector.persistence.TableMapper;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class Service {
@Autowired
private TableMapper tableMapper;
public List<TableSearchResult> getSearchResults(String param) {
return tableMapper.getAllColumnsFromTable1(param);
}
}
然后在 .JAR 方面我有
数据库连接器 pom.xml：
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>databaseconnector</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Database Connector</name>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.3</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.0.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.0.0.RELEASE</version>
</dependency>
</dependencies>
</project>
数据库连接器DatabaseConnection.java：
package com.example.databaseconnector.connector;
import javax.sql.DataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.ClassPathResource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
public class DatabaseConnection implements InitializingBean {
private DataSource dataSource;
private DataSourceTransactionManager dataSourceTransactionManager;
private SqlSessionFactoryBean sqlSessionFactoryBean;
private MapperScannerConfigurer mapperScannerConfigurer;
public DataSource getDataSource() {
return this.dataSource;
}
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
@Override
public void afterPropertiesSet() throws Exception {
if (getDataSource() == null) {
throw new IllegalArgumentException("Property 'dataSource' is required");
} else {
this.configureDataSourceTransactionManager();
this.configureSqlSessionFactoryBean();
this.configureMapperScannerConfigurer();
}
}
private void configureDataSourceTransactionManager() {
this.dataSourceTransactionManager = new DataSourceTransactionManager();
this.dataSourceTransactionManager.setDataSource(dataSource);
}
private void configureSqlSessionFactoryBean() {
this.sqlSessionFactoryBean = new SqlSessionFactoryBean();
this.sqlSessionFactoryBean.setDataSource(dataSource);
this.sqlSessionFactoryBean.setConfigLocation(
new ClassPathResource("mybatis-config.xml"));
this.sqlSessionFactoryBean.setTypeAliasesPackage(
"com.example.sewp5databaseconnector.domain");
}
private void configureMapperScannerConfigurer() {
this.mapperScannerConfigurer = new MapperScannerConfigurer();
this.mapperScannerConfigurer.setBasePackage(
"com.example.databaseconnector.persistence");
this.mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
}
}
当我运行 WebApp1 时，程序失败，因为它找不到 TableMapper bean 来自动装配服务中的映射器。我缺少什么 Spring 设置才能让所有这些都一起工作，还是我以完全错误的方式解决这个问题？
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标签： java spring maven jndi mybatis